They darted to and fro like human torpedoes.
Then Tom twirled the control knob of his density unit. Immediately he bobbed upward like a cork. A reverse twirl sent him plummeting toward the bottom again.
Bud, watching with wide-eyed excitement, began experimenting on his own.
Soon the boys were engaging in all sorts of underwater acrobatics. Presently Bud felt a nudge in the back that sent him hurtling a dozen yards through the water.
70 THE ELECTRONIC HYDROLUN6
“Snuck up on me, eh, pal?” he thought with a chuckle. “Okay, Tom old boy, here’s where the undersea terror strikes back!”
Swooping around to return the compliment, Bud gulped in surprise. Instead of his chum, he found himself face to face with a bottle-nosed dolphin!
“Good night!” Bud thought. “A porpoise! So you’re the joker who nudged me!”
With a playful toss of its comical-looking snout, the porpoise swam off, as if inviting Bud to join in the fun and games. A whole school of the creatures cavorted into view.
“Okay! If you want to play!” Chuckling, Bud darted in pursuit, whacked the porpoise that had nudged him, and jetted off again. The porpoise gave chase, whistling and grunting audibly.
Tom joined in the fun, and soon a rollicking game of underwater tag was in full swing. The dolphins seemed as playful and mischievous as small children.
Twenty minutes later the boys surfaced and hauled themselves aboard. Both tore off their masks and flopped into the boat, shaking with laughter.
“What was so funny down there?” Zimby asked.
When Tom told him about the dolphins, he too burst into laughter. The porpoises rose into view and convoyed the launch all the way back to the island.
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